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Mechanical Engineering Interview Questions

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How many types of gear boxes are there?

Asked By: aidan_suzlon | Asked On: Jul 16th, 2008

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Answered by: bala

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Member Since Nov-2005 | Answered On : Aug 2nd, 2008

Thare are 4 types of gear box.
1. sliding mesh gear box.
2.constant mesh gear box.
3.synchromesh gear box.
4.planetarty gear box.

Answered by: mech4study on: Apr 20th, 2014

Basically gear box is divided into two types. These are-

1. Manual gear box:
(A.) Sliding mesh gear box:
(B.) Constant mesh gear box:
(C.) Synchromesh gear box:

2. Automatic gear box:
(A.) Epicyclic gear box:
(B.) Hydraulic torque converter:

Answered by: ravindran DME on: Feb 16th, 2014

4type gear box
sliding mesh
constant mesh

Reverse engineering

Asked By: him_153 | Asked On: Jan 12th, 2009

In relation to solid modeling concepts, explain what do you mean by reverse engineering

Answered by: amar on: Apr 12th, 2014

reverse engineering is the process of making a cad model of the physical component...this model is then modified or added with new features for improvements..

Answered by: iamthebest_askme on: Feb 18th, 2009

It is a process in which a already engineered product is redesigned from its actual form that is by measuring the actual physical model and created again, mainly b,cos off--1> straight forward copying...

Effect of combustion of diesel in petrol engine?

Asked By: Bhushan Kulkarni | Asked On: Oct 30th, 2013

What will happen if diesel is used instead of petrol in si engine?

Answered by: JEHAN ZALA on: Apr 5th, 2014

Diesel engine combustion is done by compression but in SI engine there is spark plug for ignition so what will be the reaction when diesel will ignited by spark plug in SI engine !!

Answered by: viztashwa singh on: Mar 25th, 2014

because of their compression ratio...... compression ratio for the diesel engine is much more higher than petrol engine, diesel cant be reached to their self ignition temp. at this compression ratio

Lathe and milling machines

Asked By: sanjaymanral | Asked On: Aug 14th, 2010

What is the difference between lathe & milling machine? What are the operations that we cannot perform in lathe but milling?

Answered by: sagar on: Mar 3rd, 2014

making of drill bits and gear cutting operations are done in milling machine by indexing attachment.

it is not possible in lathe.

Answered by: Arjun on: Jan 5th, 2014

-the work piece is being driven by external power and tool is fed towards it
-we cant machine cuboidal work pieces in lathe but possible in milling machine
Milling machine
-tool is power driven and fed towards the stationary work piece.

What is meant by carburetor

Asked By: Dinesh Choudhary | Asked On: Sep 27th, 2013

Answered by: tejas on: Mar 4th, 2014

it is a device in which a/f mixture is mixed homogeneously.

Answered by: DIVYAKSHI AGARWAL on: Oct 1st, 2013

It is a device in an internal combustion engine for mixing air with a fine spray of liquid fuel.

What is the difference between process audit & product audit ?

Asked By: karanjkar | Asked On: Oct 28th, 2013

Answered by: Siddhartha Sharma on: Feb 25th, 2014

Process Audit :-Auditor will concentrate on process at each stage & itss relevant parameters process parameters like temperature, pressure, speed etc.Along with this he audits operator competency leve...

What is dtsi? Why is this used in motor bikes?

Asked By: piyush | Asked On: Sep 12th, 2011

Answered by: vinodh reddy on: Jan 18th, 2014

dtsi Is digital twin spark ignition it is 1st used by bajaj motors which helps in reducing excess fuel burn nd gives efficient milage

Answered by: Mukesh yadav on: Sep 1st, 2012

Digital Twin Spark Ignition
This is used to get better combustion in combustion chamber.Double spark plug is used to obtain better combustion of fuel in cylinder head. It provide better efficiency and economical in fuel consumption

Speed and torque

Asked By: rajkumar.t | Asked On: Jul 12th, 2009

What is the practical difference speed and torque?

Answered by: shank on: Dec 7th, 2013

the first cyclist gives his force alone but, the second cyclist gives his force with addition to the rider behind, the second cyclist have the tendency to give more torque than first cyclist.

Answered by: bhargavmech on: Aug 19th, 2009

speed is the distance traversed per unit time.. it is a scalar quantity. torque is the vector product of distance and is a vector quantity. torque= r * F where r is distance between point of...

How can we perform refrigeration by using Sunlight without using solar cell?

Asked By: shreejith | Asked On: Aug 12th, 2007

Answered by: Eng Omar on: Dec 8th, 2013

you can use ammonia vapor to cool water or is used as desert refrigerator

Answered by: shashank on: Jul 11th, 2012

u can get to the reference to patent application number 1015/del/2011

Fluid mechanics

Asked By: adnan mehmood | Asked On: Oct 30th, 2010

What is diffrence between impeller and propeller?

Answered by: احمد امام on: Dec 8th, 2013

An impeller is used to suck air into something, such as a turbocharger or a vacuum cleaner.

A propeller is used for propulsion, such as on an airplane or a boat.

Answered by: sudeeb on: Dec 19th, 2010

Impeller - of a pump throws water form the impeller center to the periphery by the action of centrifugal force and go out through the small opening provided in the casing . in this process inside ...

What is the function of disc plate in clutch?

Asked By: abhi11092451 | Asked On: Mar 17th, 2011

Answered by: Eng Omar on: Dec 8th, 2013

to transfer energy from the engine to the gearbox

Answered by: Jay on: Sep 8th, 2012

As integral part of clutch it is connected with flywheel when the wheel is to be rotated. It is connected by the force which is exerted by pressure plate. It rotates because of high friction between c...

Knocking engines

Asked By: s.murugan | Asked On: Aug 19th, 2010

What is meant by knocking? Why does it occurs?

Answered by: himanshu shekhar on: Nov 10th, 2013

knocking is natural phenomenon which occurs in ic engine. no scientist in the world is capable to clearly explain this phenomenon but the explain much part of them.... how it occurs... in petrol eng...

Answered by: Bhushan Kulkarni on: Aug 11th, 2011

"knocking" or "pinking" is the phenomenon in which pressure wave of high altitude generated strikes wall of combustion chamber.pre. waves are generated because fuel attain self ignition temp. before flame front created by spark plug reaches to it.

What is the difference between displacement pumps and centrifugal pump?

Asked By: mohammed alabsi | Asked On: Aug 21st, 2013

Answered by: Ram Prasad Sharda on: Oct 29th, 2013

displacement pump is a device which deliver a constant volume of liquid for each cycle at varying discharge (Q) pressure or HEAD.

centrifugal pump is a device in which high velocity of the liquid will then produce a velocity head and at the same time producing a high flow rate

Answered by: ahmed on: Oct 1st, 2013

positive displacement pump used for high pressure required & centrifugal pump used in case of high flow rate required

Materials for gears

Asked By: Gambit | Asked On: Oct 15th, 2009

Of which materials gears are made of?

Answered by: jaskaran singh on: Oct 24th, 2013

britial material

Answered by: venkat on: Sep 26th, 2013

The majority of gears are composed of carbon and low-alloy steels, including carburised steels. The intended gear use will dictate the material used in its creation. For example gears to be used in fo...

What is dtsi technology?

Asked By: anoop4real | Asked On: Apr 13th, 2007

Answered by: lavi bhardwaj on: Oct 20th, 2013

Dtsi(digital twine spark ignition )engine
is used for better combustion of air and fuel is only available in bajaj automobiles.

Answered by: Rodrigues sharma on: Nov 29th, 2012

DTSi is the technology only available in BAJAJ automobiles.
DTSi means Digital Twin Spark ignition.
This is better technology to get more efficiency in motor bikes and also get good consumption of fuel.

Ic engine

Asked By: mvsrprakash | Asked On: Jan 6th, 2013

What will happen by pouring diesel in petrol engine instead of petrol ?

Answered by: kausar begum on: Oct 19th, 2013

even it gets started we see un burnt , improper ignition , misfires, and white smoke , and high temperature is required to burn diesel , we use spark plugs in petrol engine, were in diesel engine we use ignitors

Answered by: rohan igavee on: Sep 26th, 2013

The air fuel ratio is set different for different fuel .That's why no strt engine.and compression ratio require more for diesel

Pressure v/s stress

Asked By: vrsaikumar | Asked On: Jun 25th, 2009

Though units for pressure and stress are same (i.E n/mm2)what is the difference between stress and pressure?

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Answered by: abhishank

View all answers by abhishank

Member Since Jun-2009 | Answered On : Jun 28th, 2009

Stress is restoring force developed in the body due to any tensile, compressive or any other force per unit area and on the other hand pressure is force applied on a body per unit area.

Answered by: farshid on: Oct 11th, 2013

stress is scaler .not vector

Answered by: manoj sharma on: Aug 8th, 2013

stress occurs in rigid bodies and pressure is studies for gases and liquids (fluids)

Cooling of water

Asked By: vishal patil | Asked On: Aug 9th, 2011

Why the water collected below mud pot is cooler than that is in the pot?

Answered by: veeresha on: Sep 24th, 2013

Lets Assume, The Mud/ Sand Below the Pot is wet. The water particles on the surface of the mud (which is in contact with Air) gets evaporated. to get evaporated that layer of water needs Latent heat t...

Answered by: Sagar Gupta on: Aug 27th, 2012

It is due heating effect of evaporation.

Stress intensity and von mises stress

Asked By: arsalan64 | Asked On: Aug 8th, 2012

In ansys software we have options for stress intensity solution and von mises analysis rather than tresca. I want to inquire the difference between stress intensity analysis and von mises analysis?

Answered by: balu on: Sep 24th, 2013

VON mises stress are used to determine the onset failure in ductile materials

Answered by: achyuth on: Feb 15th, 2013

According theory of failures von misses stress theory will give you a safe and economic design (Sys/Syt =0.57)

Gear & pinion material

Asked By: rajivg66 | Asked On: Apr 20th, 2013

How to select the gear & pinion material and which material effective selection

Answered by: vikki on: Sep 18th, 2013

Numerous nonferrous alloys, cast irons, powder-metallurgy and plastics are used in the manufacture of gears. However, steels are most commonly used because of their high strength-to-weight ratio and l...

Answered by: saeed on: Jun 10th, 2013

We select a gear which is perfect for purpose the material which can resist to wear and tear.

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